No problem, we've got 7858 and 8378 to multiply
7858 × 8378 = 8378 × (7858)
+ 8378 × 8 that equals 67024
+ 8378 × 50 giving us 418900
+ 8378 × 800 giving us 6702400
+ 8378 × 7000 what gives us 58646000

= 65834324
